def get_merged_device_data(coordinator):
    """Fetch and merge data from the coordinator for the given entry."""
    ret = {}
    for family in coordinator.data:
        ret[family['id']] = family.copy()  # Use copy to avoid modifying the original family data
        _devices = family.get("devices", []).copy()  # Use copy to avoid modifying the original list
        ret[family['id']]['devices'] = {}
        if "devices" not in family:
            continue
        for device in _devices:
            device = {**device, **device.get("statistics", {})}  # Merge statistics into device
            if device["deviceType"] == "ENERGY_STORAGE_BATTERY":
                space = family["spaces"].get(device["spaceId"], {})
                device = {**device, **space.get("battery",{})}  # Merge statistics into device
            ret[family['id']]['devices'][device['deviceId']] = device
    return ret